ADVANCED SPECTROMETER 7” WITH FOUR VERNIERS

Scale	The 178mm diameter circle is fixed and both the telescope and table are fitted with independent double–ended venires reading to 30 seconds of arc and have independent fine and coarse movements. While coarse adjustment is done by releasing the clamping screw and moving by hand ,tangent screw.
Collimator	Mounted on a fixed pillar. At one end is fitted 32mm dia clear aperture, 175 mm focus achromatic objective , and at the other end a 6mm long unilaterally adjustable slit .
Telescope	Mounted on a moveable pillar. At one end is fitted 32mm dia clear aperture 175mm focus achromatic objective, and at the other end a 15x Ramsden eyepiece and a glass crossline graticule. Both telescope and collimator have rack and pinion systems for focusing the objectives and means for leveling their optical axes and squaring them to the axis of rotation
Prism table	The 85mm diameter table is marked with lines to assist positioning of the prism with respect to leveling screws and has interchangeable clamping units for the prism and diffraction grating.
Standard	1 Prism Table, 1 Prism Clamp, 1 Diffraction Grating Holder . Packed in
Accessories	wooden box .